Sewing-machine.



, No. 7111.035;v PATENTED o oT. 13, 1903.

M. HEMLEB. SEWING MACHINE.

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M. HEMLEB.

SEWING MACHINE.'

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APPLICATION FILED JUNE 2, 1903.

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Patented October 13, 1903. l

PATENT FFCEm MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THESINGER MANUFACTURING COMPANY, A CORPORATION OF NEvV JERSEY.

SEWING-MACHINE.

SPECIFICATION forming' part of Letters Patent No. 741,035, dated October13, 1903.

Application filed June 2,1903. Serial No. 159,737. (No model.)

To all whom it may concern:

Beit known that L'MARTIN HEMLEB, a citizen of `the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Sewing-Machines, ofwhich the following is a specification, reference being had therein totheaccompanyin'g drawings.

This invention relates to that class of twoneedle sewing-machinesemploying two revolving hooks or loop-takers carried by vertical shaftsgeared to a rotating operatingshaft beneath the work-plate of themachine; and the invention has for its object to provide a machine ofthe class referred to in which the power is so applied to the verticalloop-taker shafts (which preferably run at double 4the speed of theshaft from which they are driven) in such a manner that they will runsmoothlyland evenly and so that side thrust will be avoided as far aspossible, thereby particularly adapting the machine for high speeds.

In the accompanying drawings, Figure 1 is a sideview, partly broken out,of a sewingrnachne embodying the present invention. Fig. 2 is a bottomview, and Fig. 3 a front end view, of the same.

cover-slides partly withdrawnY from working position.

Thevlnachine herein illustrated so far as concerns the feeding, take-up,andneedle-bar f mechanisms, is of awell-known type of Singer machine,said mechanisms being operated, as heretofore, from a driving-shaft 12,journaled in the upper part of the arm 13. The shaft 12 is provided withtwin cranks 14, connected by pitmen 15 with similar twin cranks 16 atthe rear end of a rotating shaft 1 7, journaled in suitable bearingsbeneath the workplate or bed 18 and provided nearits forward end withspiral gears 19, meshing with smaller spiral gears 20 on the verticalshafts 21, carrying the revolving hooks 22. v

The vertical shafts 21 are journaled in brackets 23, which arepreferably adjnstably attached to the work-plate orbed 18 by means ofscrews 24, passing through slots 25 in the horizontal portions of saidbrackets, so that Fig. 4. is a partial` plan View of thevwork-plate,with one of thev one or both of said brackets may be adjustedhorizontally to vary the distance apart of the two seams or lines ofstitching being made with the machine. The gears 19 are adjustablysecured to the shaft 17fby screws 1l, with which the collars of saidgears are provided, so that said gears 19 may be moved as required whenthe positions of the vertical hook-carrying shafts are changed. The twoneedles 26, cooperating with the two revolving hooks, are carried in theusual manner by a needle-bar 27, and in varying the distance apart ofthe seams or rows of stitches the needles may be adjustedtoward or fromeach other in any well-known manner, or interchangeable needle-clamps 28with needleholes at varying distances apart may be provided.

By the employment of spiral gears on the shafts 17 and 21 in the mannershown and described the two vertical hook-shafts 21 may both be drivenin the same direction from the shaft 17 and at any desiredrelativespeed, the said hook-shafts in the present instance performing tworotations to each rotation of the actuating-shaft 17 and of thedrivingshaft 12. Furthermore, the employment of the spiral gears in themanner shown and described enables the driven gears to be located in themiddle portions or between the ends of the vertical shafts 21, so, thatbearings for said shafts, both above and below the spiral gears 20 onsaid shafts, may be provided in the brackets 23. In other words,bearings Yfor each of the said vertical hook-carrying shafts areprovided both above and below the spiral' gears 20, where the power isapplied to saidshafts, andthere will thus be less uneven side thrust onthe shafts than would be the case were the power applied to the lowerends of the hook-shafts, and the use of the spiral gears not only admitsof the direct connection of the shafts 17 and 21 above mentioned, butalso permits the actuatingshaft 17 to be arranged at one side of thedriven shafts 21 and comparatively close to the work-plate or bed of the.machine instead of requiringsaid actuating-shaft to belocated ICG sarythat the mechanism should be as simple as possible and that the partsshould run smoothly to avoid Wear, and these results in the loop-takingmechanism ofthe present machine are largely contributed to by theemployment of spiral gearing in the manner hereinbefore set forth.

Having thus described my invention, I claim and desire to secnrebyLetters Patent- In a two-needle sewing-machine, the combination with theneedles and their operating,

mechanism, of a rotating shaft located beneath the Work-plate of themachine and provided with two spiral gears adjustably attached theretoso that their positions length- Wise of said shaft may be varied, twobrackets also beneath said Work-plate and one or both of which areadjustably attached there- MARTIN HEMLEB.

Witnesses:

ALFRED GRIEB, HENRY J. MILLER.

